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The data were collected in two Polish AI stations over the period of 1997-2002. The examined boars were at the age of 221-585 days. Heritability and repeatability of these traits, estimated using DFREML and a single-trait repeatability model, were computed as well. The LysTH/ME requirement for a working boar is 1.93 g/Mcal (105% compared to the recommendation of NCR, 1998).Ħ689 ejaculates collected from 89 boars (Polish Large White, Polish Landrace, Duroc, Hampshire, Pietrain, Duroc x Hampshire, Hampshire Pietrain, Polish Synthetic Line 880 and Line 990, PIC) were used to study the influence of age, genotype (breed) and selected environmental factors on the variability of semen characteristics (semen volume, sperm concentration, percentage of live sperms, total number of sperms, number of insemination doses). Thus, an increase of 5% of LysTH/Me compared to recommendations of NRC (1998) has improved the quantity and quality of semen. In a similar order of digestible lysine in the diets, PiDu boars had ejaculate volumes of 200.20, 201.70, and 211.30ml (P<0.0001), respectively the total number of spermatozoa were 53.40 57.92 and 58.42 billion/ejaculate, respectively.
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The results showed that at digestible lysine/ME ratio with 95% NRC, 100% NRC, and 105% NRC, DVN boars had ejaculate volumes of 205.23, 203.67 and 210.27ml (P=0.011), respectively and the total number of spermatozoa were 54.69, 58.35 and 63.25 billion/ejaculate ( P<0.0001), respectively. In each breed, the experiment was designed by a completely random one-factor method, with 3 different digestible lysine levels (95% NRC, 100% NRC and 105% NRC) and a boar per repetition and three repetitions per lysine levels. There was a total of 18 boars (9 DVN boars and 9 PiDu boars) in this study. A study was conducted in Thuy Phuong pig research and development center and in Vietnam University of Agriculture from Jun to Dec 2019 to determine the effect of digestible lysine/ME ratio to quantity and quality of semen of DVN and PiDu boars.